PSIGNAL(3) FreeBSD Library Functions Manual PSIGNAL(3)


psignal, strsignal, sys_siglist, sys_signamesystem signal messages


Standard C Library (libc, -lc)


#include < signal.h>

psignal( unsigned sig, const char *s);

extern const char * const sys_siglist[];
extern const char * const sys_signame[];

#include < string.h>

char *
strsignal( int sig);


The psignal() and strsignal() functions locate the descriptive message string for a signal number.

The strsignal() function accepts a signal number argument sig and returns a pointer to the corresponding message string.

The psignal() function accepts a signal number argument sig and writes it to the standard error. If the argument s is non- NULL and does not point to the null character, s is written to the standard error file descriptor prior to the message string, immediately followed by a colon and a space. If the signal number is not recognized ( sigaction(2)), the string “Unknown signal” is produced.

The message strings can be accessed directly through the external array sys_siglist, indexed by recognized signal numbers. The external array sys_signame is used similarly and contains short, upper-case abbreviations for signals which are useful for recognizing signal names in user input. The defined variable NSIG contains a count of the strings in sys_siglist and sys_signame.


The psignal() function appeared in 4.2BSD.
February 4, 2011 FreeBSD